CVE-2026-89865
UnknownSummary
In the Linux kernel, the scsi qla2xxx driver's FRU/I2C bsg handlers use a 256-byte DMA buffer that is not zeroed and initialize only a few leading bytes. qla2x00_write_sfp() can override the transfer length with a user-supplied value (up to 255 bytes), causing reads of uninitialized heap memory and writes to device flash.
Risk Assessment
May lead to leakage of kernel heap memory contents to device flash, constituting a confidentiality breach. Requires CAP_SYS_RAWIO privileges but can be exploited by a local user with those privileges.
Recommendation
Update the Linux kernel to a version containing the fix that uses dma_pool_zalloc() instead of dma_pool_alloc() in all five FRU/I2C handlers. Restrict granting of CAP_SYS_RAWIO privileges to the necessary minimum.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: scsi: qla2xxx: Zero SFP DMA buffer in FRU/I2C bsg handlers The FRU and I2C bsg handlers stage their transfer in a DMA_POOL_SIZE (256-byte) bounce buffer obtained from dma_pool_alloc(), which does not zero the allocation. They initialize only a few leading bytes before handing the buffer to qla2x00_write_sfp(). qla2x00_write_sfp() can override the transfer length with a user-supplied value: if (len == 1) opt |= BIT_0; if (opt & BIT_0) len = *sfp; *sfp is the first byte of the (user-controlled) payload, so len can grow up to 255. The device then DMA-reads len bytes from the 256-byte pool buffer. Since only a small prefix was written (e.g. MAX_FRU_SIZE == 36 bytes for a FRU version, one byte for a FRU status register), the hardware reads past the initialized region and writes up to ~219 bytes of stale DMA-pool heap memory to the device flash. Allocate the buffer with dma_pool_zalloc() in all five FRU/I2C handlers so any bytes beyond the initialized data are zero rather than stale heap contents.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS